CHAPTER XIY. 



SOURCES OF ANIMAL HEAT. 



Connection of the production of heat with nutrition Seat of the production of 

 animal heat Relations of animal heat to the different processes of nutri- 

 tion Relations of animal heat to respiration The consumption of oxygen 

 and the production of carbonic acid in connection with the evolution of 

 heat Exaggeration of the animal temperature in particular parts after 

 division of the sympathetic nerve and in inflammation Intimate nature of 

 the calorific processes Equalization of the animal temperature. 



THE most interesting question connected with calorifica- 

 tion relates to the sources of heat in the living organism ; 

 and a careful estimate of the physiological value of all the 

 facts that have been positively established with reference to 

 this point places the following proposition beyond any 

 reasonable doubt : 



The generation of heat in the living animal organism is 

 connected, more or less intimately, with all of the processes 

 of nutrition and disassimilation, including, of course, the 

 consumption of oxygen and the production of carbonic acid ; 

 and this function is modified, to a greater or less degree, by 

 all conditions that influence the general process of nutrition 

 or the operation of the nutritive forces in particular parts. 



This proposition is not contradicted by any well-settled 

 physiological facts or principles. Every one of the functions 

 of the body bears more or less closely upon nutrition ; and 

 all of the physiological modifications of the various func- 

 tions, without exception, affect the process of calorification. 

 AVe must bear in mind the fact, that in man and the warm- 



